Hi David,
Thanks for contacting Syncfusion support.
We have already confirmed your reported problem as defect in our ToolTip component. Fix for this issue will be included in upcoming volume 3 release, 2020 which is expected to be rolled out by late in September 2020.
You can track the status through the below portal link.
We appreciate your patience until then.
Regards,
Muthukrishnan K